from django import formsfrom .models import Topicclass TopicForm(forms.ModelForm):class Meta:model = Topicfields=['text']labels={'text':''}

#定义learning_logs的URL模式from django.conf.urls import urlfrom . import viewsapp_name='learning_logs'
urlpatterns=[#主页url(r'^$',views.index,name='index'),#显示所有主题,url(r'^topics/$',views.topics,name='topics'),#特定主题的详细页面url(r'^topics/(?P<topic_id>\d+)',views.topic,name='topic'),#用于添加新主题的网页url(r'^new_topic/$',views.new_topic,name='new_topic'),]

from django.shortcuts import renderfrom django.http import HttpResponseRedirect
from django.urls import reverse_lazyfrom .forms import TopicForm
from .models import Topic# Create your views here.
def index(request):'''学习笔记的主页'''return render(request,'learning_logs/index.html')def topics(request):topics = Topic.objects.order_by('date_added')context = {'topics': topics}return render(request, 'learning_logs/topics.html', context)def topic(request,topic_id):'''显示单个主题以及所有的条目'''topic=Topic.objects.get(id=topic_id)entries=topic.entry_set.order_by('-date_added')context = {'topic':topic,'entries':entries}return render(request, 'learning_logs/topic.html', context)def new_topic(request):'''添加新主题'''if request.method !='POST':#未提交数据：创建一个新表单form = TopicForm()else :#POST提交的数据，对数据进行处理form = TopicForm(request.POST)if form.is_valid():form.save()return HttpResponseRedirect(reverse('learning_logs:topics'))context = {'form':form}return render(request,'learning_logs/new_topic.html',context)

{% extends "learning_logs/base.html" %}
{% block content %}
<p>Add a new topic:</p><form action="{% url 'learning_logs:new_topic' %}" method='post'>{% csrf_token %}{{ form.as_p }}<button name="submit">add topic</button>
</form>
{% endblock content %}

{% extends "learning_logs/base.html" %}
{% block content %}
<p>Topics</p>
<ul>{% for topic in topics %}<li><a href="{% url 'learning_logs:topic' topic.id %}">{{ topic }}</a></li>{% empty %}<li>No topics have been added yet.</li>{% endfor %}
</ul>
<a href="{% url 'learning_logs:new_topic' %}">Add a new topic:</a>
{% endblock content %}